Refer to Engine Controls Schematic
Cruise Control Module, and VSS
.
Circuit Description
Output driver modules (ODMs) are used by the powertrain control module (PCM) to turn ON many of the current-driven devices that are needed to control various engine and transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. DTC P1585 set indicates an improper voltage level has been detected on the output circuit which controls the stepper motor cruise control inhibit circuit.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
| • | An improper voltage level has been detected on the output circuit which controls the cruise control inhibit. |
| • | The above condition is present for at least 30 seconds. |
Action Taken When the DTC Sets
The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.
Conditions for Clearing the MIL/DTC
| • | The DTC becomes history when the conditions for setting the DTC are no longer present. |
| • | The history DTC clears after 40 malfunction free warm-up cycles. |
| • | The PCM receives a clear code command from the scan tool. |
Diagnostic Aids
Inspect for the following conditions:
Many situations may lead to an intermittent condition. Perform each inspection or test as directed.
Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
| • | Loose terminal connection |
| - | Use a corresponding mating terminal to test for proper tension. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| - | Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| • | Damaged harness--Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
| • | Inspect the powertrain control module (PCM) and the engine grounds for clean and secure connections. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
If the condition is determined to be intermittent, reviewing the Snapshot or Freeze Frame/Failure Records may be useful in determining when the DTC or condition was identified.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
This step tests the ignition feed voltage.
-
This step tests for a shorted component or a short to battery positive voltage on the control circuit. Either condition would result in a measured current of over 500 milliamps. Also tests for a component that is going open while being operated, resulting in a measured current of 0 milliamps.
-
This step tests for a short to voltage on the control circuit.
-
This step ensures that the replacement PCM, which utilizes an electrically erasable programmable read only memory (EEPROM), is programmed when installed.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On Board Diagnostic (OBD) System Check? | -- | ||
Important: Normally, ignition feed voltage should be present on the control circuit with the PCM disconnected and the ignition turned ON. Is the voltage near the specified value? | B+ | |||
Does the current reading remain between the specified values? | 0.001-0.5 amp (1-500 mA) | |||
Is the voltage at the specified value? | 0.0 V | |||
5 | Locate and repair short to voltage in the cruise inhibit control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
6 |
Is the fuse open? | -- | ||
7 |
Did you complete the repair? | -- | -- | |
8 |
Is the voltage near the specified value? | B+ | ||
9 | Test the cruise inhibit control circuit for an open or a short to ground. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
10 | Inspect for the following conditions:
Did you find and correct the condition? | -- | ||
11 |
Does the test lamp flash ON and OFF? | -- | Go to Diagnostic Aids | |
12 | Test the cruise inhibit control circuit for a faulty connection at the PCM. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
13 | Locate and repair open in ignition feed circuit to the stepper motor cruise control module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |
14 | Replace the cruise control module. Refer to Cruise Control Module Replacement in Cruise Control. Did you complete the replacement? | -- | -- | |
|
Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Did you complete the replacement? | -- | -- | ||
16 |
Does the scan tool indicate DTC P1585 failed this ignition? | -- | System OK |
